"I don't exactly remember which pin it was (it's been two years since I hacked mine), but the FASST receivers all have full PPM output on one pin of the main MCU within it. Some probing with an Oscope should work. Good luck."
"Brad, you can find more technical information from their wiki/repository at http://code.google.com/p/th9x/
There are also links to other similar projects. Check it out.. it's rather good :)
And that radio.. Well I have one TGY 9X and also…"
"I'm sure there are some advantages (maybe range), but for what we do, which is constrained to line of sight, I don't see the advantages. There are so many challenges in aerial robotics that reinventing the perfectly serviceable RC…"
"Interesting. I've been reading about the open source "Speck Drum" receiver, which does mixing and such on the receiver instead of the TX. What do you think about that? Also, what do you think about moving from a typical RC radio…"
"PPM is really fast and easy to read for most microprocessors. Autopilots these days tend to have loads of extra digital pins (ArduPilot Mega has 40 spare!) and never enough serial ports, so keeping RC on digital makes sense."